Molder&#39;s pattern



April 26 1927.

D. J. CAMPBELL MOLDERS PATTERN Filed Dec. 5. 1924 3 Sheets-Sheet l lnngnjgr w Dona k5 J. Gampbeu ril I AP 1927 D. J. CAMPBELL MOLDERS PATTERN Filed Dec. 5. 1924 3 Sheets-Sheet 2 5 Dona 6 13 az/gimf Patented Apr. 26, 1927.

UNITED STATES DONALD J". CAMPBELL, OF MgU'SKEGON HEIGHTS, MIQHIGAN.

MOLDER S PATTERN.

Application filed December 3, 1924. Serial No. 753,571.

This invention relates to a molders pattern particularly adapted for use in making sand molds wherein the sand is compressed around the pattern by first jolting or vibrating and then squeezing and condensing the same and the pattern has an upper part of greater dimensions than the intermediate portion thereof, my invention permitting the use of a single flask in which the pattern maybe used. This simplifies the operation of making the molds and in many ways is conducive to economy and speed in the quantityproduction of green sand molds.

For an understanding of the invention and the constructions embodying the same, reference may be had to the following description, taken in connection with the accompanying drawings, in which,

Fig. 1 is a vertical section through the fiask and the mold therein, the pattern being shown in side elevation but with parts broken away to .disclose the inner construe tion, the sand of the mold having been jolted in the flask and condensed more at the bottom thanat the upper portion of the flask.

Fig. 2 is a View similar to Fig. 1 showing the flask, mold and pattern at the completionot the squeezing operation.

Fig. 3 is a View similar to Figs. 1 and 2, the two parts of the pattern being shown separated and drawn tromth-e mold.

"Fig. 4 is a horizontal section-through the pattern substantially on the line l4e of Fig. 1.

Fig. 5 is a plan view o'l theflask-and patterirbel'ore any sand has been introduced into the flask around the pattern, and

Fig. 6 is a vertical transverse section through the pattern taken on the plane of line 6-6 of Fig. '1.

' Like reference characters refer to *like parts in the different figures off the drawings.

The pattern shown is one used for the production ofmolds for cylinder blocks of internal combustion engines. It includes a ,ed to be placed on afiask board 15 andthe flask 16, shown as a rectangular form, is

lower member having a base 1 from which a plurality of spaced apart upwardly projecting cylinders 2 extend, theend cylinders each being formed at its upper end with a rectangular shaped opening 3 therein. This pattern is for a four-cylinder engine block and there are tour of the cylinder-s2 shown,

but with a'greater number of cylinders in the engine block the number of upwardly thereof being received in the recesses 9.

(thereof. a guide pin 14 extends upwardly tor a purpose which will later appear.

projecting cylinders 2 will be correspondingly increased. Projecting from the sides 0]": thebase 1 are gate flanges which are extended at one end to make parallel sides l and 5 the same being connected at their end by a cross bar 6 from which a vertical riser rod 7 extends, midway between the ends of the bar 6.

The upper part of the pattern 8 is formed on its under side with a plurality of cylindrical recesses 9 separated from each other by partitions or webs 10 and 10 In prac tice this upper part of the pattern is de signed to be placed over the upper ends o l the cylindrical projections 2, the upper ends A stem 11 is loosely mounted through the up per side of the member '8 of the pattern at- .each' of the end recesses 9, and at its lower end is provided with a head 12, the width of which is less than the width of the recess 3 in the cylindrical projection directly below, and the length of which is less than the length of said recess but greater than the width of the recess. This is thus constructed that when de sired the head may be turned so that it will enter the recess and go to the bottom thereof or on elevating the upper member 8 ot the pattern and turning the head through ninety degrees, it will extend across the recess '3 so that at its ends it bears upon the upper end of the'cylindrical projection 2 of-the lower portion of the pattern, therebyelevating the upper portion'of the pattern a distance equal substantially to the depth of the recess 3. Each stem 11 at its upper end is provided with a handle 13 whereby the stem may be turned or, when it is desired to remove the upper portion of the pattern, both handles may be grasped to lift said upper part ol the pattern away from the lower portion At each end otthe upper part 8 The lower portion of the pattern is adaptoppositeends and at the lower edgeot the flask. The upper portion of :the pattern is then placed.on the cylinders 52 and held in llil upper position, as shown in Fig. 1, the heads 12 being turned so as to bear upon the upper ends of the cylinders 2. Sand is then placed in the flask and the same vibrated or jolted up and down, this serving to condense the sand in the lower portion of the flask. A dummy ring or frame 18 is then located around the upper end of the flask. The rod 7 extends upwardly inside an end of the flask and to its upper end an inverted frusto-conical extension 19 is detachably connected, the upper end of which reaches to the upper edges of the flask 16. The flask with the ring 18 thereon is then filled with additional sand which is put in the same to the level of the upper side of the dummy ring or frame 18. The ring or frame 18 is removed and the sand subjected to a squeezing operation, handles 13 first being grasped to turn the heads 12 into position such that theymay enter the recess 3.

F or squeezing the sand in the flask a squeezing head 20 is secured to any suitable form of backing or abutment beam 21, the head 20 being provided with guide recesses 22 for the pins 14,- on the pattern portion 8 to enter and with other recesses 23 for the entrance of the handles 13. The squeezing may be accomplished in any desired manner as, for instance, by an upwardly moving hydraulic ram, or otherwise, having a table at its upper end on which the flask board 15 rests; and with the upward movement of such ram the sand is squeezed and compressed from the upper level shown in Fig. 1 to a lower level substantially flush with the upper edges of the flask 16, as shown in Fig. 2. This causes the sand in the upper part of the flask to be properly tamped and condensed around the pattern to correspond with the more condensed sand in the lower part of said flask, and to fill all of the interstices of the pattern, not only those beneath the overhanging lateral portions of the upper part 8 but also those between the cylindrical projections 2, the sand being given the proper density and consistency for molds of green sand. it is obvious that the gate parts 4, 5 and 6 and the riser rod 7, with its upper enlargement 19, provide openings and passages when the pattern parts have been drawn from the mold for the flow of the metal to the mold as is necessary in pouring molten iron into molds.

After the squeezing operation on the mold has been performed, the flask, board 15 and pattern are removed as an entirety from the squeezing mechanism and the upper part of the pattern is drawn by grasping the handles 13 and elevating the same while the lower part of the pattern is drawn by an elevation of the flask with the mold therein leaving the mold as shown in Fig. 3, which when coupled with the proper mold located below the same for the reception of the engine base core and with a proper covering mold is ready for casting.

The construction of pattern is relatively simple but very practical and effective for use in manufacturing articles from cast iron 1 having an irregular shape like an internal combustion engine cylinder block wherein it has been more or less difficult to get the sand properly tamped and condensed under the over-hanging upper portions of the cylinder block pattern and between the cylinders, which are fairly close. together. This pattern is particularly effective for the production of green sand molds where the sand may be condensed to proper consistency by a combined jolting and squeezing operation. This is evident from the fore oing description. The invention is defined in the appended claims and is to be considered as comprehensive of all forms of structure coming within their scope.

I claim: 7

1. In a device of the class described, a lower pattern member formed with spaced apart recesses in its upper side near each end thereof, an upper pattern member located over the upper end of the lower pattern member and telescopically mounted thereon, and manually operable means mounted on said upper pattern member adapted when moved to one position to enter said recesses and when in another position bridging said recesses, whereby said upper pattern member is adapted to be located in two clifferent positions, one lower than the other upon said lower pattern member.

2. A pattern comprising, a lower pattern member including a base and a plurality of upwardly projecting cylinders located in alignment, each of the end cylinders being provided with a rectangular recess in its upper end, an upper pattern member formed with cylindrical recesses in its lower side adapted to receive the upper ends of said cylinders of the lower pattern member, and means mounted adjacent each end of the upper pattern member and extending into the end recesses thereof adapted to either bear upon the upper ends of said end cylinders or be received in the recesses therein, whereby the upper pattern member may be located in two different horizontal planes with respect to the lower pattern member, substantially as described.

3. A pattern comprising, a lower pattern member including a base and a plurality of upwardly projecting cylinders, certain of said cylinders having rectangular recesses formed in the upper ends thereof, an upper pattern member fori .ed with cylindrical recesses in its lower side for the reception of the upper ends of said cylinders of the lower pattern member, vertical stems rotatably mounted in the upper pattern member and positioned so as to he one over each recess in a cylinder of the lower pattern member, a rectangular shaped head attached to the lower end of each stem and formed so as to be received in a recess in said cylinders when turned to one position but bridge and extend across said recess when in another position, and means fixed to the upper end of each stem above the upper pattern member for turning the same to said different positions, substantially as and for the pur- 10 poses described.

In testimony whereof I afiix my signature.

DONALD J. CAMPBELL. 

